Phonograph.



L. McARTHUR. PHONOGRAPH.

APPLICATION man NOV. 24. me.

1,249,?9L MGM m 11,1917,

rubrics-nests;

narrator,

To all whom it may concern:

lite it louownthat l, Lustre Modernism, a subject oi the lhlingoi Great Britain, re siding at l lenilworth, in the county of (look and State ot-llllinois, have invented new and useful improvements in lPhonographs, of which the following is a specification, reference being had to the accompanying drawsound bolt.

the usual record carrier,

til

Fig, 3 is a section at the line, 3-3, on Fig 2.,

ll ige is a detail section at the line, l-4t, on Fig, 3..

Fig, 5 is a detail section at the line, 5-5, on Fig, 3. v

Fig. t ion section at Fig. 3, 1

'llhe phonograph shown in the drawings is in general, of a familiar type, comprising A, with motor for actuating it, not shown, being inclosed within the support or frame structure, (3, upon which is mounted the bracket, l), which constitutes a fired portion of the soundconduit to whose Verticallyextended and positioned upper portion, D the tone arm, E, is connected for swinginghorizontally to carry the reproducer, ll, over the record in the usual manner of thls class of devices The reproducer or sound box, it, carrying the stylus, H, is connected tothe tone arm by means of an elbowon the tone arm, having an obliquely-extending arm, l-ll which is inter-telescoped with an obliquely-extend:- ing arm, J, of the elbow, J, rigid with the sound box. lihe inclined elbow arms, H and J, are mounted upon each other for relative rotation about their common axis,

the line, 6--tl, on

constituting a swivel connection between the sound box about whose sound bolt may be adjusted from tone arm and the axis the a position at which the stylus may coiiperate with a record ot'the zigzag type, to a pe ttpectflcatlon of Letters Patent.

with a record ot the hill-andvalley adapted, and

- in which it hppllcatiou tiled November 2%, this. serial .tto. 'lttt tttl.

properly type. For the purpose oi rendering this joint snug and adapted to cause the sound born to re main safely at either position. to which it is at the same time rendering said adjustment reasonably easy, the inter teiescoped parts at this 'joint,-said arms, lit and J ,---are provided with recesses, it? and j",

sition at which it may cotiperate modating a bow-spring, it, having its middle part engaged in the recess in one of said members and its ends in the recess in the other member, and thereby reacting be tween the two members tor-holding the joint snug and providing a frictional resist ance to the relative rotation. of said mornhere. The recesses, b and 7' are circumierentially extended so that the aggregate amount of play of the spring lodged therein circumferentially of the justment oi. the two members upon each other which is made for shifting the sound box from one of said operative positions to the other; and the spring thereby, together with the recesses in-which it is lodged, constitutes the means for limiting this adjusting movement of r the sound hon. lhis spring being a flat spring, and the recesses is lodged being channels in the respective members whose width is [substantially that of the flat spring, said spring when engaged in the channels of the two members constitutes a hey for retaining the two members together. it is understood that the two members will be engaged with the key spring therein by first placing the spring in the recess in the inner member, its ends being lodged in said recess, and compressing the middle-point or bow to admit it into the other of said members, H whereupon the two members being longitudinally telescoped to their stop shoulders, the recesses, 15 and 7' being thereby registered with each other, the bow of the spring will snap into the recess, b and the membars will be locked together. llhat they can not be disengaged is not an objection, in

case of breakage-oi the spring, it will be loclring togcther oi? the two inter-telescoped at their inteutelescoped area, said recesses openlng into each other and accomtill Ill

inter-telescoped members is the amount otthe annular adtill members, 15'." and J end for limiting their relative rotation, not at one side only us by the spring, ebove described, but at the opposite side also, and for that purpose the more familiar expedient may be employechcon sisting of e pin, H inserte side through the outer of after they are intentelescoped with each other, engaging a cireunii erentiellyextending slot, f, in the inner oi said members, the extent oi the slot being that of the annular adjustment of said members which is to be provided for.

The tone arm, E, for the purpose of good acoustic effect is desirably mode as shown, comprising in one piece the reach from (but not including) the elbows which effect its connection with the sound he extending over the record to he pivoted end of the tone arm, and the el ow, E at said pivoted end, which extends down into the vertically-'- positioned member of the sound conduit, consisting of the 'upwa-rdl wprojecting arm, D of the bracket, This tone arm is not only integral throughout the entire extent, but of substantially uniform thickness throughout, as indicated by the sectional views thereof seen in the drawings; and this feeture,-substentiel uniformity of thickness, us Well as integra1ity,-is found imfrom the outportunt in. producing the desired effects upon the tone. 1

'For pivoting the tone arm to the vertically-positioned member of the sound eonduit for swinging oi the tone arm and the sound box over the record, and for the vertical movement of the tone arm necessary to Withdraw the stylus from. the record, the vertically-positioned terminal member, D of the bracket, D, is provided at its upper end with an interiorly-fiunged colla ltd, whose flange, M terms with the upper end of the bracket arm, D", an annular in- Wardly-opening channel around. the sound. conduit. The flange, ll, has diametrically opposite notches, m", and there islodged in this channel, m a packing ring, d l, ot suitably soft and tough material to constitute a. cushion between the tone arm and the said; sound conduit member, D the tone arm. having the downwardlyextending elbow arm, E of such outer diameter as to tit snugly within the pecking ring, N, and having opposite gudgeons, e e, which emer through the notches m of the linnge, lift", of the collar, M, and lodge upon and engage with the packing ring, ll, so that said pnclo ing ring becomes interposed between the metal of the gudgeons and. the metal of the fixed member of thesound conduitgfD- and prevents not only the communication of vibrations from one member to the other, but also prevents any rubbing of the gudg'cons upon the metal which would tend to produee vibrations which night interfere with members.

the tone deli ered through the tone arm from the reproduccr or sound box. Preterably, in order to insure that the packing ring turns around in the seat provided for it, instead of having the gudgeons of the tone a' 'm ride around upon said packing ring, the packing ring is provided with notches, n for engagement of the gudgeous;

and in order that the gudgeons may be protected from contact, not only with the lower metal wall of the channel, of, which is formed by the upper end of the sound conduit member, l)", but also from the upper metal wall of said recess which is formed by the flange, M The notches, if, are undercut, as seen in Fig". 3, so that the gudgcons entering the notches and the tone arm being then turned slightly, the gudgeons enter into the undercut portion 01 the notch and are thereby guarded lroni contact with the flange, M

In order to prevent the tone arm from being swung across the record to the injury of the latter by the stylus when the stylus runs out of the sound gl'OOVB of the record at the end of the course of the letter, there provided av check pin, G, jutting into the sound conduit member, l), in a position for being encountered by the edge, e, of the lower lutorally cut away terminal portion, E of the tone arm, E, at the position of the tone arm whichis reached when the stylus has completed its travel. in the sound groove of the record. The terminal, E being laterally cut away through about 180 degrees of its circumference for discharge oi? the sound (hr-zmgh the remainder of the sound conduit, thejpin, G, allows the tone arm a swing of at least 180 degrees, which is uniple for all purposes.

I Cltllilll 1. In =1. phonograph, in combination with e. tone arm pivoted tor swinging over the record, having at its pivoted end :1 downwardly-turned elbow; e vci'tically-positioned sound conduit member into which said elbow arm extends; a collar at the top of said conduit having an inlnrncd flange forming an internal annular channel at the top of said conduit member; a. packing ring of cushioning and soiuid-diuuleni11g n'iatcriel lodged in said channel. and free for rotation about its vertical axis, the down-turned elbow arm dimensioned to lit within said ring and having gudgeons which pivotnlly engage said ring for rotating the ring in the channel with said tone arm in the mo ement of the latter for swinging over the record.

2. In it phonograph, in cmnbinetion with a tone arm pivoted for swinging; over the record, having at its pivoted end a downwardly-turned elbow arm, n vertically-posi- 'Wardly-turne posite'ly-positioned channel; a packing ring of cushioning and in eger flange forming an interior annular channel at the top of said conduit member and having. oppositely-positioned notches leading into said channel; a acking ring of cushioning and sound-dea ening material lodged in said channel and free for rotation about the vertical axis thereof, the down-turned elbow arm havin qgudgeons which enter through said notc es and pivotall engage said packing ring for carrying t e latter with said tone arm in the swinging movcment of said tone arm over the record about the vertical axis of said channel.

3. In a phonograph, in combination with a tone arm pivoted for swinging over the record, havin at its pivoted end a downelbow arm; a vertically-positioned sound conduit member into which said elbow arm extends), a collar at the top of said conduit having an in-turned flange forming an internal annular channel at the top of said conduit member and having opnotches leading into said sound-deadening materlal lodged in said channel free for rotation therein about its vertical axis, the down-turned elbow arm having oppositely-positioned gudgeons which enter through said notches and the packing ring havin in its upper surface undercut notches a apted to receive said gudgeons, whereby the tone arm is pivoted to the packing ring for vertical movement, and the packing ring constitutes a turntable for the tone arm in the swin ing movement of the latter over the record In a phonogra h, in combination with a tone arm pivote for swingin over the record, havin at its pivoted en a downwardly-turne elbow arm which is laterally cut away at its lower portion for discharge of the sound into the remainder of the sound conduit; a vertically-positioned sound conduit member into which said elbow arm extends, and in which it opens laterally, and a stop pin jutting inwardl from the wall of sold sound conduit mem er in osition to be encountered by the edge 0 the laterally-cut away elbow terminal of the tone arm limiting the swing of the tone arm over the record.

In testimony whereof, I have hereunto set my hand eta-Chicago, Illinois, this 22nd day of November, 1916.

LESLIE MCAR'IHIJR. 

